The list celebrates 40 fearless, bold and influential men and women who “don’t need permission to be who they are and wear what they want”. Williams and Keys were named alongside fellow sports stars and Olympians like Michaela Deprince, Aly Raisman, Laurie Hernandez, Gracie Gold, as well as entertainment stars like Sophia Bush, Lady Gaga, Bobbi Brown, Tyra Banks and Zac Posen.

Serena, a 39-time Grand Slam champion boasting an Open Era record 23 major titles in singles, has faced body shaming throughout her career - everything from her gender to her body to her skin color - but she’s not allowing the hate to affect her on or off the court.

“If they’re going to attack me from a tweet, then their opinion is pretty insignificant in my life.”

Madison Keys

"It isn’t always easy to be on the stage playing a tournament and have someone making a comment about your body, that it’s too strong," Serena told TIME Magazine.

“I think any experience can make you stronger… I don’t let anything break me.”

And 22-year-old Keys, a finalist at this year's US Open, who is no stranger to online bullying, is using her celebrity and platforms to raise awareness for cyberbullying and encouraging young people to be kinder to each other online.

“A lot of the times the things people will say about you, your family, the people you care about - it’s really, really horrible,” she said.

“If they’re going to attack me from a tweet, then their opinion is pretty insignificant in my life.”

Through the organization FearlesslyGirl, Keys visits high schools across the country to speak out and help put an end to online bullying.